US4935353A - Preparation of strains of Bacillus thuringiensis having an improved activity against certain lepidopterous pests and novel strain produced thereby - Google Patents

Preparation of strains of Bacillus thuringiensis having an improved activity against certain lepidopterous pests and novel strain produced thereby Download PDF

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US4935353A
US4935353A US06/784,562 US78456285A US4935353A US 4935353 A US4935353 A US 4935353A US 78456285 A US78456285 A US 78456285A US 4935353 A US4935353 A US 4935353A
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bacillus thuringiensis
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Denis H. Burges
Paul Jarrett
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MicroBio Group Ltd
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
    • C12N1/205—Bacterial isolates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
    • C07K14/32—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Bacillus (G)
    • C07K14/325—Bacillus thuringiensis crystal peptides, i.e. delta-endotoxins
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates
    • A01N63/20—Bacteria; Substances produced thereby or obtained therefrom
    • A01N63/22—Bacillus
    • A01N63/23—B. thuringiensis
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
    • C12R2001/00—Microorganisms ; Processes using microorganisms
    • C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
    • C12R2001/07—Bacillus
    • C12R2001/075—Bacillus thuringiensis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S435/00—Chemistry: molecular biology and microbiology
    • Y10S435/8215—Microorganisms
    • Y10S435/822—Microorganisms using bacteria or actinomycetales
    • Y10S435/832—Bacillus

Definitions

  • This invention relates to the preparation of new strains of a toxin-producing bacterium having entomocidal activity, a new strain thereby produced and the use of this bacterium to protect plants susceptible to certain pests.
  • this invention relates to a new strain of Bacillus thuringiensis which has an improved entomocidal activity against certain lepidopterous pests.
  • Broad spectrum pesticides are a useful and valuable tool for crop protection, but the indiscriminate use of broad spectrum chemical insecticides can disrupt many natural control agents. Since most chemical insecticides are relatively non-selective, they may destroy non-target organisms, including beneficial predators and parasites of destructive pests. Some insects also develop resistance to chemical insecticides, which often make them uncontrollable by these insecticides and may permit minor pests to become major ones.
  • Bacillus thuringiensis a number of strains of which are commercially available and are currently exploited for their unique insecticidal activity when eaten by susceptible larvae, particularly those of the insect order Lepidoptera.
  • Bacillus thuringiensis fits well into current agricultural theories which support the use of naturally occurring organisms to suppress harmful insects. It is a widely distributed, rod-shaped, spore forming, aerobic, gram positive micro-organism and is characterised by producing, during the sporulation cycle, one or more proteinaceous parasporal crystals; its pathogenicity for lepidopterous larvae; its ability to use citrate as its sole source of carbon; and the exceptionally high phosphate content of its spore.
  • Bacillus thuringiensis is a common inhabitant of the environment and is capable of growth in certain types of soils. It has no known adverse effect on life forms such as man, pets, birds, fish, earthworms, most beneficial insects or plants. Its pathogenicity to sensitive insects is essentially due to the presence of a parasporal crystal, which may represent 30 to 40% of the dry weight of the cell at the time of sporulation.
  • the principal effect is due to the crystal which acts only after its dissolution in the intestines of the larvae.
  • the activation of the crystal is caused by a combination of alkaline pH and proteolytic enzymes in the gut contents.
  • the reaction is dependent on the high gut pH of lepidopterous larvae (pH >7), which allows the release of the toxic components of the crystal. These toxins break down the mid-gut wall causing feeding to stop.
  • Bacillus thuringiensis as an insecticide provides an effective and environmentally acceptable method of dealing with lepidopterous pests.
  • the present invention provides a novel strain of Bacillus thuringiensis, GC91, a sample of which has been deposited at the National Collection of Type Cultures (NCTC), Central Public Health Laboratory, Colindale Avenue, London NW9 5HT, under the accession number: NCTC 11821, deposited on Sept. 7, 1984, or a derivative or mutant thereof having entomocidal activity against lepidopterous pests.
  • NCTC National Collection of Type Cultures
  • This new strain effectively combines the potential entomocidal activities of two strains of Bacillus thuringiensis, one of which is an asporogenic mutant and so does not exhibit entomocidal activity although it contains the genetic material which would enable it to do so if it did produce spores or crystals.
  • the surprising potency of the new strain, GC91 cannot be achieved by the use of a mere admixture of the two mutant strains.
  • the novel strain has an improved entomocidal activity against lepidopterous pests in the genera Galleria, Mamestra, Heliothis, Spodoptera and Pieris.
  • the invention also provides a process for producing a strain of Bacillus thuringiensis having improved entomocidal properties by combining into a single strain the different entomocidal properties of two respective starting strains, which comprises:
  • step (b) transferring a plasmid which codes for delta-endotoxin crystal synthesis from a second starting strain (donor) or mutant thereof into the mutant (recipient) produced in step (a), to thereby produce the desired new strain.
  • asporogenic mutant having substantially the same plasmid profile as that of the second starting strain.
  • the plasmid is then transferred from the asporogenic mutant into the recipient mutant produced in step (a).
  • the first starting strain is strain HD 135 and the mutant produced in step (a) is strain 135-S4 (NCTC 11822).
  • the second starting strain is strain HD 191 and the asporogenic mutant is strain 191-A2 (NCTC 11823).
  • the invention further provides a process for producing Bacillus thuringiensis GC 91 (NCTC 11821), which comprises transferring from Bacillus thuringiensis strain 191-A2 (NCTC 11823) into Bacillus thuringiensis strain 135-S4 (NCTC 11822) a plasmid which codes for delta-endotoxin crystal synthesis in strain 191-A2.
  • strains 191-A2 and 135-S4 are grown together in mixed culture to effect conjugation-like plasmid transfer, the mixed culture is diluted and transferred to a solid medium to obtain single colonies, colonies of strain GC 91 are selected by the increased size of the parasporal crystal and the strain GC 91 is cultured therefrom.
  • the invention also provides an entomocidal substance derived from Bacillus thuringiensis strain GC 91 (NCTC 11821), or from a derivative or mutant thereof, or from a strain produced according to a process as defined above.
  • the entomocidal substance is a spore-crystal complex.
  • the invention further provides an entomocidal composition
  • Bacillus thuringiensis strain GC 91 NCTC 11821
  • an agricultural adjuvant such as a carrier, diluent, surfactant or application-promoting adjuvant.
  • the composition may also contain a further biologically active compound selected from fertilisers, micronutrient donors, plant growth preparations, herbicides, insecticides, fungicides, bactericides, nematicides and molluscicides and mixtures thereof.
  • the composition may comprise from 0.1 to 99% by weight of Bacillus thuringiensis GC 91 or the derivative or mutant thereof, or the entomocidal substance; from 1 to 99.9% by weight of a solid or liquid adjuvant, and from 0 to 25% by weight of a surfactant.
  • the strain of Bacillus thuringiensis, GC91, or the composition containing it, may be administered to the plants or crops to be protected together with certain other insecticides or chemicals without loss of potency.
  • It may be administered as a dust, a suspension, a wettable powder or in any other material form suitable for agricultural application.
  • the mother cells lyse and release the spores and crystals into the growth medium.
  • the spores and crystals may be harvested by centrifugation or filtration, spray drying, vacuum drying, or a method of precipitation, such as the lactose co-precipitation technique as reported by Dulmage et al. (Journal of Invertebrate Pathology, 15, 15-20, 1970).
  • the resulting spore-crystal complex is stable for long periods and can be formulated into a product suitable for application to crops.
  • a method for preparing an insecticidal composition according to the invention comprises culturing the Bacillus thuringiensis strain GC 91 by:
  • stage (H) introducing 2 to 20 percent by weight of the incubating liquor of stage (G) into a production fermenter containing an aqueous cultivating medium
  • the agar and broth in A to D should contain at least one nitrogen source, at least one carbon source, and at least one salt, preferably peptone, glucose and at least one salt.
  • the media in F to J should contain at least one nitrogen source (e.g., peptone, yeast extract, corn steep liquor, soya bean meal, cotton seed meal, fishmeal), at least one carbohydrate source (e.g., glucose, lactose, sucrose, starch or raw material rich in these constituents) and at least one mineral salt.
  • the nitrogen and carbohydrate should be balanced to exhaust as near as possible simultaneously.
  • the spore-crystal complex or the composition containing it may be administered to the plants or crops to be protected together with certain other insecticides or chemicals without loss of potency.
  • non-viable product may be advantageous in certain circumstances where it is desired to prevent the spread of bacteria for aesthetic reasons or to avoid causing disease in beneficial lepidoptera, e.g. silkworms.
  • non-viable products are generally not as active as those containing live spores, and as a further disadvantage there is the increased cost of killing the spores.
  • the invention furthermore relates to a method of treating plants, which comprises applying an entomocidally effective amount of B. thuringiensis GC91, or a composition thereof.
  • Target crops to be protected within the scope of the present invention comprise e.g. the following species of plants:
  • cereals wheat, barley, rye, oats, rice, sorghum and related crops
  • beet sucgar beet and fodder beet
  • drupes pomes and soft fruit (apples, pears, plums, peaches, almonds, cherries, strawberries, rasberries and blackberries), leguminous plants (beans, lentils, peas, soybeans), oil plants (rape, mustard, poppy, olives, sunflowers, coconuts, castor oil plants, cocoa beans, groundnuts), cucumber plants (cucumber, marrows, melons) fibre plants (cotton, flax, hemp, jute), citrus fruit (oranges, lemons, grapefruit, mandarins), vegetables (spinach, lettuce, asparagus, cabbages and other brassicae, onions, tomatoes, potatoes, paprika), lauraceae (avocados, carrots, cinnamon, camphor), deciduous trees and conifers (e.g.
  • Bacillus thuringiensis GC91
  • GC91 Bacillus thuringiensis, is normally applied in the form of compositions and can be applied to the crop area or plant to be treated, simultaneously or in succession, with further biologically active compounds. These compounds may be both fertilisers or micronutriant donors or other preparations that influence plant growth.
  • Suitable carriers and adjuvants can be solid or liquid and correspond to the substances ordinarily employed in formulation technology, e.g. natural or regenerated mineral substances, solvents, dispersants, wetting agents, takifiers, binders or fertilisers.
  • compositions i.e. the compositions, preparations or mixtures containing B. Thuringiensis, GC 91, as an active ingredient or combinations thereof with other active ingredients, and, where appropriate, a solid or liquid adjuvant, are prepared in known manner e.g. by homogeneously mixing and/or grinding the active ingredients with extenders, e.g. solvents, solid carriers, and in some cases surface-active compounds (surfactants).
  • extenders e.g. solvents, solid carriers, and in some cases surface-active compounds (surfactants).
  • Suitable solvents are: aromatic hydrocarbons, preferably the fractions containing 8 to 12 carbon atoms, e.g. xylene mixtures or substituted naphthalenes, phthalates such as dibutyl phthalate or dioctyl phthalate, aliphatic hydrocarbons such as cyclohexane or paraffins, alcohols and glycols and their ethers and esters, such as ethanol, ethylene glycol monomethyl or monoethyl ether, ketones such as cyclohexanone, strongly polar solvents such as N-methyl-2-pyrrolidone, dimethylsulfoxide or dimethylformamide, as well as vegetable oils or epoxidised vegetable oils such as epoxidised coconut oil or soybean oil; or water.
  • aromatic hydrocarbons preferably the fractions containing 8 to 12 carbon atoms, e.g. xylene mixtures or substituted naphthalenes, phthalates such as dibutyl phthalate or
  • the solid carriers used e.g. for dusts and dispersible powders are normally natural mineral fillers such as calcite, talcum, kaolin, montmorillonite or attapulgite.
  • Suitable granulated adsorptive carriers are porous types, for example pumice, broken brick, sepiolite or bentonite; and suitable nonsorbent carriers are materials such as calcite or sand.
  • a great number of pregranulated materials of inorganic or organic nature can be used, e.g. especially dolomite or pulverised plant residues.
  • suitable surface-active compounds are non-ionic, cationic and/or anionic surfactants having good emulsifying, dispersing and wetting properties.
  • surfactants will also be understood as comprising mixtures of surfactants.
  • Suitable anionic surfactants can be both water-soluble soaps and water-soluble synthetic surface-active compounds.
  • Suitable soaps are the alkali metal salts, alkaline earth metal salts or unsubstituted or substituted ammonium salts of higher fatty acids (C 10 -C 22 ), e.g. the sodium or potassium salts of oleic or stearic acid, or of natural fatty acid mixtures which can be obtained, e.g. from coconut oil or tallow oil.
  • Further suitable surfactants are also the fatty acid methyltaurin salts as well as modified and unmodified phospholipids.
  • so-called synthetic surfactants are used, especially fatty sulfonates, fatty sulfates, sulfonated benzimidazole derivatives or alkylarylsulfonates.
  • the fatty sulfonates or sulfates are usually in the forms of alkali metal salts, alkaline earth metal salts or unsubstituted or substituted ammonium salts and generally contain a C 8 -C 22 alkyl radical which also includes the alkyl moiety of acyl radicals, e.g. the sodium or calcium salt of lignosulfonic acid, of dodecylsulfate, or of a mixture of fatty alcohol sulfates obtained from natural fatty acids.
  • These compounds also comprise the salts of sulfuric acid esters and sulfonic acids of fatty alcohol/ethylene oxide adducts.
  • the sulfonated benzimidazole derivatives preferably contain 2 sulfonic acid groups and one fatty acid radical containing about 8 to 22 carbon atoms.
  • alkylarylsulfonates are the sodium, calcium or triethanolamine salts of dodecylbenzenesulfonic acid, dibutylnaphthalenesulfonic acid, or of a naphthalenesulfonic acid/formaldehyde condensation product.
  • corresponding phosphates e.g. salts of the phosphoric acid ester of an adduct of p-nonylphenol with 4 to 14 moles of ethylene oxide.
  • Non-ionic surfactant are preferably polyglycol ether derivatives of aliphatic or cycloaliphatic alcohols, or saturated or unsaturated fatty acids and alkylphenols, said derivatives containing 3 to 30 glycol ether groups and 8 to 20 carbon atoms in the (aliphatic) hydrocarbon moiety and 6 to 18 carbon atoms in the alkyl moiety of the alkylphenols.
  • non-ionic surfactants are the water-soluble adducts of polyethylene oxide with polypropylene glycol, ethylenediaminopolypropylene glycol and alkylpolypropylene glycol containing 1 to 10 carbon atoms in the alkyl chain, which adducts contain 20 to 250 ethylene glycol ether groups and 10 to 100 propylene glycol ether groups. These compounds usually contain 1 to 5 ethylene glycol units per propylene glycol unit.
  • non-ionic surfactants are nonylphenolpolyethoxyethanols, castor oil polyglycol ethers, polypropylene/polyethylene oxide adducts, tributylphenoxypolyethoxyethanol, polyethylene glycol and octylphenoxypolyethoxyethanol.
  • Fatty acid esters of polyoxyethylene sorbitan, such as polyoxyethylene sorbitan trioleate, are also suitable non-ionic surfactants.
  • Cationic surfactants are preferably quaternary ammonium salts which contain, as N-substituent, at least one C 8 -C 22 alkyl radical and, as further substituents, lower unsubstituted or halogenated alkyl, benzyl or hydroxyl-lower alkyl radicals.
  • the salts are preferably in the form of halides, methylsulfates or ethylsulfates, e.g. stearyltrimethylammonium chloride or benzyldi-(2-chloroethyl)ethylammonium bromide.
  • the entomocidal compositions usually contain 0.1 to 99%, preferably 0.1 to 95%, of Bacillus thuringiensis, GC91, or combination thereof with other active ingredients, 1 to 99.9% of a solid or liquid adjuvant, and 0 to 25%, preferably 0.1 to 20%, of a surfactant.
  • compositions may also contain further ingredients, such as stabilisers, antifoams, viscosity regulators, binders, tackifiers as well as fertilisers or other active ingredients in order to obtain special effects.
  • further ingredients such as stabilisers, antifoams, viscosity regulators, binders, tackifiers as well as fertilisers or other active ingredients in order to obtain special effects.
  • the new strain of Bacillus thuringiensis, GC91 was elaborated from two other Bacillus thuringiensis strains using the following experimental protocol described in the Examples.
  • the starting strain was a wild-type, H-serotype 7, var aizawai strain of Bacillus thuringiensis, HD 135 (freely available from Dr. H. T. Dulmage, Cotton Insects Research Laboratory, U.S. Dept. of Agriculture, Brownsville, Tex.).
  • Strain HD 135 is listed in the catalogue entitled “Bacillus thuringiensis cultures available from the U.S. Department of Agriculture", Agricultural Reviews and Manuals ARM-S-30/Oct. 1982. It is also listed as available in the catalogue entitled “Collection de Souches de Bacillus thuringiensis 1983" of Institute Pasteur, 25 rue de Do Frankfurt Roux, 75724 Paris Cedex 15, France (index number 7-28).
  • Strain HD 135 showed entomocidal activity to Pieris brassicae, Mamestra brassicae, Heliothis virescens, Heliothis armigera, Galleria mellonella and Spodoptera littoralis (See Table 1 below).
  • Strain HD 135 was grown in Nutrient Broth (Oxoid Ltd, U.K.) (Composition: Lab-Lemco Powder 1.0 g/l, yeast extract L-20 2.0 g/l, Peptone L-37 5.0 g/l, NaCl 5.0 g/l) for 16 hours at 42° C. The culture was then diluted in 0.8% (W/V) bactopeptone (Difco) and plated onto Nutrient agar (Oxoid Ltd, U.K.) (Composition as Nutrient Broth, but with addition of Agar No. 3 15.0 g/l) to achieve approximately 100 colonies per plate. Incubation was then carried out for 48 hours at 30° C.
  • Electrophoresis on SDS (sodium dodecyl sulphate) polyacrylamide gels of solubilized crystal protein from the wild type, HD 135, and 135-S4 showed that the parasporal crystals of 135-S4 lacked a polypeptide of Mr 130K.
  • the methods used to purify crystals, dissolve them and run them on SDS polyacrylamide gels are known in the art and described, for example, by P. Jarrett, Journal of Applied Bacteriology 1985, 58, 437-448.
  • Bioassay of strain 135-S4 showed that entomocidal activity was lost to Pieris brassicae and Heliothis virescens but retained in Mamestra brassicae, Galleria mellonella, Heliothis armigera and Spodoptera littoralis (Table 1).
  • strain 135-S4 The entomocidal activity of strain 135-S4 to a number of lepidopterous pests is shown in Table 1.
  • a second mutant strain, coded 191-A2 was derived from a wild-type H-serotype kurstaki strain HD 191 (obtained from Dr. H. T. Dulmage, Cotton Insects Research Laboratory, U.S. Dept. of Agriculture, Brownsville, Tex.). Strain HD 191 is listed as available in the catalogues of the U.S. Department of Agriculture and the Institute Pasteur (index number 30-49) referred to in Example 1.
  • Strain HD 191 was streaked onto the surface of Nutrient agar (composition of media: Lab-Lemco Powder (L-29) 1.0 g/liter, Yeast Extract (L-20) 2.0 g/liter, Peptone (L-37) 5.0 g/liter, sodium chloride 5.0 g/liter, Agar No. 3 15.0 g/liter) and incubated at 42° C. for 48 hours. After incubation, the plates were examined under a dissecting microscope at about 8 times magnification. Many small, raised areas or papillae were observed scattered throughout the streaks, indicating asporogenic colonies. These were picked out and restreaked onto Nutrient agar and incubated at 30° C. for 48 hours.
  • Nutrient agar composition of media: Lab-Lemco Powder (L-29) 1.0 g/liter, Yeast Extract (L-20) 2.0 g/liter, Peptone (L-37) 5.0 g/liter, sodium chloride 5.0 g/liter
  • strain 191-A2 has been deposited at NCTC under the accession number NCTC 11823, deposited on 7th Sept. 1984.
  • the donor 191-A2 and the recipient strain an acrystaliferous mutant derived from the Bacillus thuringiensis strain HD 1, were grown separately on Brain Heart Infusion agar (Oxoid) plates [ingredients in g/l: Calf Brain Infusion Solids 12.5, Beef Heart Infusion Solids 5.0, Protease Peptone (Oxoid L 46) 10.0, sodium chloride 5.0, dextrose 2.0, sodium phosphate anhyd. 2.5 and Agar No. 3 15.0]. After incubating for 16 hours at 30° C., a loopful of cells from each strain are mixed together on the surface of a Brain Heart Infusion agar plate and incubated for a further 24 hours at 30° C.
  • the resulting growth is then streaked onto Nutrient agar plates (Oxoid) and incubated for 48 hours at 30° C. to allow the recipient to sporulate.
  • a loopful of growth from the nutrient agar plate is then suspended into 10 ml of sterile distilled water and heated at 60° C. for 15 minutes to kill the asporogenous donor 191-A2 (the spore-forming recipient is unharmed). Reversion of the donor 191-A2 to produce heat resistant endospores occurred at frequencies of >1 in 10 7 viable cells after growth on Nutrient agar plates.
  • the 50 Md plasmid from 191-A2 was transferred into the mutant 135-S4.
  • Individual colonies of 135-S4, possibly containing the 50 Md plasmid, colonies were microscopically examined to select for those producing crystals of increased size.
  • the percentage of 135-S4 colonies producing crystals of increased size after plasmid transfer in two separate experiments was 29% and 21%. Plasmid profiles of such colonies showed the presence of a 50 Md plasmid in all (10) large crystal-producing colonies analysed. It was concluded that uptake of the 50 Md plasmid resulted in an increase in the size of the parasporal crystal and concomitant alteration and increase in the entomocidal activity of the mutant 135-S4.
  • the combined entomocidal activity was improved in respect of the pest species Spodoptera littoralis, Heliothis armigera, Heliothis virescens, Mamestra brassicae, Galleria mellonella and Pieris brassicae.
  • Mutant 135-S4 containing the additional 50 Md plasmid was designated as mutant GC91.
  • strain GC91 The entomocidal activities of strain GC91 and of other strains of Bacillus thuringiensis are given in Table 1.
  • Bacillus thuringiensis, GC91 is thoroughly mixed with the adjuvants and the mixture is thoroughly ground in a suitable mill, affording wettable powders which can be diluted with water to give suspensions of the desired concentration.
  • Emulsions of any required concentration can be obtained from this concentrate by dilution with water.
  • Ready for use dusts are obtained by mixing the active ingredient with the carriers, and grinding the mixture in a suitable mill.
  • the active ingredient or combination is mixed and ground with the adjuvants, and the mixture is subsequently moistened with water.
  • the mixture is extruded, granulated and then dried in a stream of air.
  • the finely ground active ingredient or combination is uniformly applied, in a mixer, to the kaolin moistened with polyethylene glycol. Non-dusty coated granulates are obtained in this manner.
  • the finely ground active ingredient or combination is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired concentration can be obtained by dilution with water.
  • novel strains of Bacillus thuringiensis disclosed herein i.e. GC91, 135-S4 and 191-A2 all have, apart from the exceptions specifically mentioned, the morphological and biochemical characteristics typical of the genus and species. Different varieties can be distinguished by H-serotyping (based on flagellar or H-antigens) as described by H. de Barjac (1981), [Chapter 3 in Microbial Control of Pests and Plant Diseases 1970-1980, Ed. H. D. Burges, Academic Press, 1981].
  • NCTC 11821 GC91
  • NCTC 11822 135-S4
  • NCTC 11823 191-A2

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US5147640A (en) * 1988-11-07 1992-09-15 Ecogen Inc. Strains of bacillus thuringiensis insecticidal compositions containing the same
US5698440A (en) * 1990-11-14 1997-12-16 Abbott Laboratories Bacillus thuringiensis mutants which produce high yelds of crystal delta-endotoxin
US5759538A (en) * 1995-03-31 1998-06-02 Monsanto Company Bacillus thuringiensis apr and npr genes, apr and npr B.t. strains, and method of use
US5874289A (en) * 1989-11-17 1999-02-23 Abbott Laboratories Bacillus thuringiensis mutants which produce high yields of crystal delta-endotoxin
US6258356B1 (en) 1995-02-10 2001-07-10 Valent Biosciences Corp. Methods for controlling insect pests with compositions containing Bacillus thuringiensis strains
US6455079B1 (en) * 2000-03-31 2002-09-24 Council Of Scientific And Industrial Research Process of its application against lepidopteran insects using Albizzia lebbeck plant extract and Bacilus thuriengiensis delta-endotoxin
US6482636B1 (en) 1999-08-12 2002-11-19 Certis Usa, L.L.C. Constructed Bacillus thuringiensis strains producing mosquitocidal crystal proteins
WO2003011341A1 (fr) * 2001-07-27 2003-02-13 Sanofi-Synthelabo Otc S.P.A. Composition solide contenant des spores de bacteries non pathogenes du genre bacillus
WO2005107383A2 (en) 2003-12-16 2005-11-17 Monsanto Technology Llc Secreted insecticidal protein and gene compositions from bacillus thuringiensis and uses therefor
US20110064710A1 (en) * 2009-09-11 2011-03-17 Benson Terry A Novel bacillus thuringiensis isolate
CN113603544A (zh) * 2021-09-07 2021-11-05 山东新超农业科技有限公司 一种辣椒生物菌肥的制备方法

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Cited By (23)

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US5147640A (en) * 1988-11-07 1992-09-15 Ecogen Inc. Strains of bacillus thuringiensis insecticidal compositions containing the same
US5874289A (en) * 1989-11-17 1999-02-23 Abbott Laboratories Bacillus thuringiensis mutants which produce high yields of crystal delta-endotoxin
US6210952B1 (en) 1990-11-14 2001-04-03 Valent Biosciences Corp. Bacillus thuringiensis mutants which produce higher yields of crystal delta-endotoxin than their corresponding parental strains
US5698440A (en) * 1990-11-14 1997-12-16 Abbott Laboratories Bacillus thuringiensis mutants which produce high yelds of crystal delta-endotoxin
US6264942B1 (en) * 1991-02-05 2001-07-24 Valent Biosciences Corp. Bacillus thuringiensis containing compositions
US5801046A (en) * 1991-02-05 1998-09-01 Abbott Laboratories Bacillus thuringiensis isolates
AU668859B2 (en) * 1991-02-05 1996-05-23 Valent Biosciences Corporation Novel (bacillus thuringiensis) isolates
WO1992013941A1 (en) * 1991-02-05 1992-08-20 Abbott Laboratories Novel bacillus thuringiensis isolates
US6258356B1 (en) 1995-02-10 2001-07-10 Valent Biosciences Corp. Methods for controlling insect pests with compositions containing Bacillus thuringiensis strains
US5759538A (en) * 1995-03-31 1998-06-02 Monsanto Company Bacillus thuringiensis apr and npr genes, apr and npr B.t. strains, and method of use
US5962264A (en) * 1995-03-31 1999-10-05 Monsanto Company Method of reducing the proteolytic degradation of bacillus thuringiensis insecticidal toxic protein
US6482636B1 (en) 1999-08-12 2002-11-19 Certis Usa, L.L.C. Constructed Bacillus thuringiensis strains producing mosquitocidal crystal proteins
US6455079B1 (en) * 2000-03-31 2002-09-24 Council Of Scientific And Industrial Research Process of its application against lepidopteran insects using Albizzia lebbeck plant extract and Bacilus thuriengiensis delta-endotoxin
WO2003011341A1 (fr) * 2001-07-27 2003-02-13 Sanofi-Synthelabo Otc S.P.A. Composition solide contenant des spores de bacteries non pathogenes du genre bacillus
US20040241772A1 (en) * 2001-07-27 2004-12-02 Tiziano Prato Solid composition cantaining bacillus-type non-pathogenic bacterial spores
AU2002333278B2 (en) * 2001-07-27 2007-05-31 Sanofi-Aventis S.P.A Solid composition containing Bacillus-type non-pathogenic bacterial spores
KR100970787B1 (ko) * 2001-07-27 2010-07-16 사노피-신텔라보 오티씨 에스.피.에이. 바실러스-유형 비-병원성 박테리아 포자를 포함하는 고상조성물
US8039006B2 (en) * 2001-07-27 2011-10-18 Sanofi-Aventis S.P.A. Solid composition containing bacillus-type non-pathogenic bacterial spores
HRP20040066B1 (en) * 2001-07-27 2012-02-29 Sanofi-Synthelabo Otc S.P.A. Solid composition containing bacillus-type non-pathogenic bacterial spores
WO2005107383A2 (en) 2003-12-16 2005-11-17 Monsanto Technology Llc Secreted insecticidal protein and gene compositions from bacillus thuringiensis and uses therefor
US20110064710A1 (en) * 2009-09-11 2011-03-17 Benson Terry A Novel bacillus thuringiensis isolate
US8551757B2 (en) 2009-09-11 2013-10-08 Valent Biosciences Corporation Bacillus thuringiensis isolate
CN113603544A (zh) * 2021-09-07 2021-11-05 山东新超农业科技有限公司 一种辣椒生物菌肥的制备方法

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PT81260B (pt) 1987-10-20
ES8609476A1 (es) 1986-07-16
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US5063055A (en) 1991-11-05
ZA857689B (en) 1986-05-28
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IL76580A (en) 1989-12-15
IL76580A0 (en) 1986-02-28
AU603541B2 (en) 1990-11-22
GB8524826D0 (en) 1985-11-13
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MY100319A (en) 1990-08-11
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PH24924A (en) 1990-12-26
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